package com.klun.concDesign.chapterFive.Disruptor_5_4;

public class FalseSharing implements Runnable {
    public final static int NUM_THREADS = 4 ;
    public final static long ITERATIONS = 500L * 1000L * 1000L;
    public final int arrayIndex;
    private static VolatileLong[] longs = new VolatileLong[NUM_THREADS];
    static {
        for (int i = 0; i < longs.length; i++) {
            longs[i] = new VolatileLong();
        }
    }

    public FalseSharing(final int arrayIndex) {
        this.arrayIndex = arrayIndex;
    }

    public static void main(String[] args) throws InterruptedException {
        final long start = System.currentTimeMillis();
        runTest();
        System.out.println("duration = " + (System.currentTimeMillis() - start));

    }
    private static void runTest() throws InterruptedException {
        Thread[] threads = new Thread[NUM_THREADS];

        for (int i = 0; i < threads.length; i++) {
            threads[i] = new Thread(new FalseSharing(i));
        }
        for(Thread t : threads){
            t.start();
        }
        for(Thread t : threads){
            t.join();
        }
    }

    @Override
    public void run() {
        long i =  ITERATIONS +1;
        while (0 != --i){
            longs[arrayIndex].value = i;
        }
    }

    public final static class VolatileLong{
        public volatile long value = 0L;
         public long p1,p2,p3,p4,p5,p6,p7; // comment out28321
    }
}
